| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
spiny |
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vertebrate |
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arthropod |
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sentient |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Examples of primary consumers include:
rats |
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cows |
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fish |
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all of these |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.
The formula for acceleration is which of the following?
\(\vec{a} = { \vec{F} \over m }\) |
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\(\vec{a} = \vec{F} m\) |
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\(\vec{a} = { m \over F }\) |
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\(\vec{a} = { m \over \vec{F} }\) |
Newton's second law of motion leads to the formula for acceleration which is a measure of the rate of change of velocity per unit time and, if you solve for positive acceleration, reveals how much net force is needed to overcome an object's mass. The formula for acceleration is \(\vec{a} = { \vec{F} \over m }\) or, solving for force, \(\vec{F} = m\vec{a}\).
Which of the following is not true of light waves?
can travel through a vacuum |
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travel faster than sound waves |
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are electromagnetic waves |
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are mechanical waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
Earth's troposphere layer is which of the following?
coldest |
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farthest from the surface |
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hottest |
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closest to the surface |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.